Piano and Dimming Light Using
Ultra Low-End MCU and
Electric-Field Sensor
Designer Reference Manual
RS08
Microcontrollers
DRM085
Rev. 0
10/2006
freescale.com
Piano and Dimming Light Using Ultra Low-End MCU and
Electric-Field Sensor
Designer Reference Manual
by: Ulises Corrales
Manuel Davalos
Allan Led Collins
RTAC Americas
Mexico
Piano and Dimming Light Using Ultra Low-End MCU and E-Field Sensor, Rev. 0, Draft A. 09/2006
Freescale Semiconductor
3
Revision History
To provide the most up-to-date information, the revision of our documents on the World Wide Web will be
the most current. Your printed copy may be an earlier revision. To verify that you have the latest
information available, refer to http://www.freescale.com
The following revision history table summarizes changes contained in this document. For your
convenience, the page number designators are linked to the appropriate location.
Revision History
Date
Revision
Level
07/2006
0
Description
Page
Number(s)
Initial release
N/A
Piano and Dimming Light Using Ultra Low-End MCU and E-Field Sensor, Rev. 0, Draft A. 09/2006
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Freescale Semiconductor
Chapter 1
Designer Reference Manual Usage Notes
1.1
1.2
1.2.1
1.2.2
Intended Application Functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Quick Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
System Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MC9RS08KA2 PADL Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7
7
7
7
Chapter 2
Hardware Description
2.1
2.1.1
2.1.2
2.2
2.2.1
2.2.2
2.3
2.3.1
2.3.2
2.4
2.4.1
2.4.2
2.4.3
2.4.4
2.4.5
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Piano Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Dimmer Light Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MC9RS08KA2 Microcontroller Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical-Field Imaging Device (MC34940). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MC9RS08KA2 PADL Reference Design Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MC9RS08KA2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Field (MC34940). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Board Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PADL Components Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Layout Explanation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PCB Board Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Component Placement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Layout Layers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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11
12
12
12
13
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13
13
14
15
15
15
15
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Chapter 3
Firmware Description
3.1
3.1.1
3.1.2
3.2
3.2.1
3.2.2
3.2.3
3.2.4
3.2.5
3.2.6
3.3
3.3.1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Firmware Basics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Application Basics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Project Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Coding Convention. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
List of Project Files. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MCU Peripherals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Software Interrupts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Main Variables of the Project . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Memory Usage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Firmware Implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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21
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Appendix A BOM and Schematics
Appendix B Glossary
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Chapter 1
Designer Reference Manual Usage Notes
1.1 Intended Application Functionality
This reference design demonstrates the application of Freescale’s MC9RS08KA2 microcontroller and the
MC34940 electrical field. This demonstration shows the connection between MC9RS08KA2 and the
electrical-field sensor.
This demonstration can play seven musical notes (C, D, E, F, G, A, B) and be heard in a buzzer. A switch
can change a piano function to a dimmer-light function with one electrode divided into five parts of varying
intensity. One electrode connects to the electrical field when the demonstration works on a dimmer
function. When the demonstration works in piano function, the electrical field is connected to seven
electrodes.
The MC9RS08KA2 PADL reference design is intended for the toy industry and for use in some lighting
devices (for example, lamps).
1.2 Quick Start
The demonstration shows the connection between the MC9RS08KA2 ultra low-end, 8-bit microcontroller
and the MC34940, an electrical-field imaging device.
1.2.1 System Requirements
This demonstration needs only a 12 V DC external power supply to work properly.
1.2.2 MC9RS08KA2 PADL Setup
The MC9RS08KA2 PADL demonstration requires no setup. The board is distributed with the application
loaded in the MC9RS08KA2 flash memory. Changing between functions depends on the switch position.
Figure 1-1 and Figure 1-2 are pictures of the reference design board.
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Designer Reference Manual Usage Notes
1.
2.
3.
4.
5.
6.
Figure 1-1. MC9RS08KA2 PADL Board (Front)
1.
2.
3.
4.
5.
6.
Figure 1-2. MC9RS08KA2 PADL Board (Back)
Switch — Selects between piano and dimmer light.
BDM connector
Power supply
Buzzer
Dimmer electrodes
Piano electrodes
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To run the demonstration:
1. Put the switch in position 1 or position 2.
a. Position 1 selects dimming mode.
b. Position 2 selects piano mode.
2. Connect the 12 V DC power supply to the demo board.
3. Start pressing the electrodes.
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Designer Reference Manual Usage Notes
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Chapter 2 Hardware Description
2.1 Introduction
This section describes the module design and features.
Figure 2-1 shows the basic blocks of each reference design component.
Power Supply
3.3 V Regulator
1 DC Bulb, 1 Buzzer
Switch Function
1 or 2
MC9RS08KA2
Electrical Field
Electrodes
Figure 2-1. MC9RS08KA2 PADL Building Block
This demo has two functions (both use the electrical-field sensor):
• Piano
• Light dimmer
2.1.1 Piano Function
In the piano function, MC9RS08KA2 is connected to the electrical field (MC34940), the seven electrodes
(from the seven different musical notes), and a buzzer (Figure 2-2).
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Hardware Description
MC34940
A
B
C
MC9RS08KA2
B
E7
Level
E6
A
E5
G
E4
F
E3
E
D
C
E2
E1
Shield
Power Stage
Buzzer
Figure 2-2. MC9RS08KA2 PADL Function 1 Logic Diagram
2.1.2 Dimmer Light Function
When the demo runs in dimmer light function, the MC9RS08KA2 MCU is connected to an electrical field
and DC bulb. The electrical field is also connected to a divided electrode. Figure 2-3 shows the logic block
diagram for function 2.
MC34940
A
MC9RS08KA2
Level
E1
Shield
Power Stage
DC Bulb
Figure 2-3. MC9RS08KA2 PADL Function 2 Logic Diagram
2.2 Technical Data
This section provides technical details of the MC9RS08KA2 PADL and components in this reference
design.
2.2.1 MC9RS08KA2 Microcontroller Unit
The MC9RS08KA2 is the control unit for the PADL and part of the RS08 family.
MC9RS08KA2 features:
• 8-bit RS08 CPU
– Analog comparator (ACMP)
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MC9RS08KA2 PADL Reference Design Architecture
•
•
•
– Keyboard interrupt (KBI)
– Pending interrupt indication
– Background debug mode (BDM)
Reset, clock, COP watchdog
6-bit port with digital filtering and programmable rising- or falling-edge trigger
Memory
– 2K flash EEPROM
– 63 bytes RAM
MC9RS08KA2 functions:
• Controls the MC34940 (electrical field)
• Generates the pulse width modulation (PWM) for the dimming light and musical notes
• Switches between PADL functions
• Processes data
2.2.2 Electrical-Field Imaging Device (MC34940)
MC34940 is a sensor that detects objects in an electrical field. In this demonstration, it detects the user’s
hands.
Features:
• Supports up to nine electrodes and two references or electrodes
• Shield driver for driving remote electrodes through coaxial cables
• Lamp driver output
• Watchdog and power-on reset timer
• High-purity sine wave generator tunable with external resistor
Function:
• Relays electrode status to microcontroller
2.3 MC9RS08KA2 PADL Reference Design Architecture
2.3.1 MC9RS08KA2
The MC9RS08KA2 controls the application.
The application occupies these modules:
• General-purpose input/output pins (GPIO)
• Analog comparator (ACMP)
• Modulo timer (MTIM)
2.3.2 Electrical Field (MC34940)
The MC34940 generates a low radio frequency sine wave with nominal 5 V peak-to-peak amplitude. An
internal multiplexer routes the signal to one of seven terminals under the ABC input terminals. A receiver
multiplexer connected to the selected electrode simultaneously routes its signal to a detector that
converts the sine wave to a DC level. The DC level is filtered by an external capacitor, and that value is
multiplied so the value offset is less sensitive to objects near the signal.
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Hardware Description
A capacitor is formed between the driving electrode and the object, each forming a plate that holds the
electrical charge. The voltage measured is an inverse function of the capacitance among the electrode
being measured, the surrounding electrodes, and other objects in the electrical field surrounding the
electrode. Increasing capacitance decreases voltage.
The basic building block for these devices is found in Figure 2-4 and shows its connections and
functionality, the shield module, and the electrode select.
MC34940
VCCCAP
ROSC
47 μF
47 μF
39 kΩ
VDDCAP
LPCAP
MCU
10 nF
Analog In
Electrode Select
LEVEL
3
A, B, C
Shield Enable
E1
SHIELDEN
Field Electrodes
(E1 through E7)
+12 V
VPWR
E7
TEST
AGND
GND
Figure 2-4. Electrical-Field Building Block
2.4 Board Layout
The detailed layout, schematic, and bill of materials (BOM) of the MC9RS08KA2 PADL reference design
are shown in this section.
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2.4.1 PADL Components Board
Figure 2-5. PADL Component Side
2.4.2 General Layout Explanation
The circuit board layout considerations are dominated by:
• Minimizing size
• The need to conduct high currents into the module, to the power drivers, and then out of the module
2.4.3 PCB Board Size
The circuit board size is 7.1 x 3.8 inches.
2.4.4 Component Placement
Before laying out the PCB, components were placed on the PCB. Figure 2-6 shows the separated main
blocks. Low-level analog, digital circuitry, and high-current switches were separated to maintain signal
integrity.
MC9RS08KA2
Switch
Op Amps
Power
Supply
Power
Surge
Light Bulb
and
Buzzer
Electrical Field
Piano and Light Dimmer Electrodes
Figure 2-6. PADL Board and Main Blocks
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Hardware Description
•
•
•
•
BDM Connector—Near the MC9RS08KA2 microcontroller.
Power Stage Block—Digital devices are separated from the high-current management blocks.
Electrical-Field Footprints—Electrodes must be near the electrical-field electrodes to avoid
parasite capacitance.
Via Dimensions and Spacing—Electrode spacing is 244 mil. The electrode width is 636 mil, and
the electrode height is 1476 mil. The vias spacing is 35 mil.
2.4.5 Layout Layers
2.4.5.1 Top Layer
The low-analog and digital signals are separated from battery and high current traces to avoid
interference between the signals; the signals from the piano and dimmer electrodes are near the
electrical-field device.
Figure 2-7. Top Layer
2.4.5.2 Bottom Layer
Similar to the top layer, the low-analog and digital signals are separated from battery and high current
traces to avoid interference between the signals (Figure 2-8).
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Figure 2-8. Bottom Layer
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Hardware Description
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Chapter 3 Firmware Description
3.1 Introduction
This section describes MC9RS08KA2 PADL firmware.
3.1.1 Firmware Basics
This project was written using the CodeWarrior™ V 5.1 development tool. The application source file for
this demo was written in assembly language.
3.1.2 Application Basics
The application demonstrates how to connect the MC9RS08KA2 to the MC34940.
3.2 Project Introduction
This section introduces and describes firmware implementation of the PADL project.
3.2.1 Coding Convention
All source code was written using guidelines to make the final product more readable.
The most important guidelines:
• Variables—Begin in uppercase to distinguish between words.
• Subroutines—In uppercase only at the beginning and are underscored to distinguish between
words.
• Macros—Uppercase; underscores distinguish between words.
• Tags—In the first column of every row.
3.2.2 List of Project Files
These files are required for the project:
• Project files—PADL.mcp is the CodeWarrior Project file.
• Configuration files—MC9RS08KA2.inc contains definitions. Derivative.inc contains watchdog feed
macro.
• Application source files—Main.asm contains the demonstration’s main application.
3.2.3 MCU Peripherals
This section briefly describes the RS08 peripherals used in the project and summarizes the necessary
microcontroller resources.
The MC9RS08KA2 MCU is used in this demonstration with the SOIC 8-pin package.
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Firmware Description
3.2.3.1 GPIO Module
If the demonstration is in piano mode, the GPIO module is configured as follows:
• Outputs—PTA1 (pin 7), PTA3 (pin 2), PTA4 (pin 6), and PTA5 (pin 5).
• Inputs—PTA0 (pin 8) and PTA2 (pin 1).
PTA3, PTA4, and PTA5 are the selectors of electrodes.
PTA1 is the PWM output (this signal goes to a buzzer create a sound).
PTA2 selects between function 1 and function 2.
PTA0 goes to the level signal; it indicates whether an electrode was pressed.
If the demonstration is in dimmer mode, the GPIO module is configured:
• Outputs—PTA1 (pin 7) and PTA4 (pin 4).
• Inputs—PTA0 (pin 8) and PTA2 (pin 1).
PTA1 is needed to discharge a capacitor. This is necessary to emulate an ADC.
PTA4 is the PWM output (this signal goes to a DC bulb).
PTA0 is an input for the level signal; it goes to the ACMP.
PTA2 selects between function 1 (piano) and function 2 (dimmer).
3.2.3.2 ACMP Module
The ACMP module is configured for only the dimmer light. When the ACMP— is greater than ACMP+, an
interrupt generates. With this we can determine the ADC value.
ACMP+ is located in pin number 8 (PTA0).
ACMP– is located in pin number 7 (PTA1).
3.2.3.3 MTIM Module
The MTIM module emulates the ADC. The MTIM interrupts every 1 ms; this configuration works only for
function 2. In function 1, the module interrupts every 40 counts.
3.2.4 Software Interrupts
See Table 3-1 for software interrupts used in the MC9RS08KA2 PADL.
Table 3-1. Interrupts
Module
Type of Interrupt
Purpose
ACMP
Asynchronous
Verify whether ACMP– is
above ACMP+
MTIM
Asynchronous
Generate PWM
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Firmware Implementation
3.2.5 Main Variables of the Project
These variables control module functionality:
• Var
• Times
• SensorReading
• C1
• C2
• CountsSet
• CounterClr
• CounterL
• Counts
• PCBuffer
3.2.6 Memory Usage
Table 3-3 shows software memory usage of the MC9RS08KA2 PADL.
Table 3-2. Memory Usage
Memory Type
Total Size (Bytes)
Used Memory (Bytes)
Free Memory (%)
Flash
2048
491
Approx. 77%
RAM
63
11
Approx. 82%
3.3 Firmware Implementation
This section contains the complete description of the firmware included with the board.
3.3.1 Application
When the switch is in position 1 (logic level 0), the application works on the piano demonstration. This
function selects one of the seven electrodes and knows which was pressed (Figure 3-1and Figure 3-2).
The application switches three pins (PTA3, PTA4, and PTA5) from 001 to 111 (see Figure 3-1, Figure 3-2,
and Table 3-3); this signal is sent to the electrical field and then selects an electrode to read the level
voltage. This is the main loop from this firmware section.
NOTE
The signals A, B, and C can be switched at least 2 ms after the last changes
were made.
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Firmware Description
MC34940
1
0
0
MC9RS08KA2
A
E7
B
C
Level
B
E6
A
E5
G
E4
F
E3
E2
E1
E
D
C
Shield
Power Stage
Buzzer
Figure 3-1. MC9RS08KA2 Piano and Dimming Switches Signals
MC34940
1
1
1
MC9RS08KA2
A
E6
B
A
E5
G
E4
F
E3
E
D
C
E7
B
C
Level
E2
E1
Shield
Power Stage
Buzzer
Figure 3-2. MC9RS08KA2 Piano and Dimming Switches Signals
Table 3-3. Signals Switch to Select a Pad
Microcontroller Signals
Electrical-Field Signals
A
B
C
0
0
1
E1
Selected Pad
C
0
1
0
E2
D
0
1
1
E3
E
1
0
0
E4
F
1
0
1
E5
G
1
1
0
E6
A
1
1
1
E7
B
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Firmware Implementation
After the electrode is selected, it is assigned the number of counts necessary to generate a musical note.
The counts and the MTIM (configured with a prescaler of 1 and 40 counts before interrupts) generate the
PWM. The PWM subroutine requires the pulse in the middle of the period (Figure 3-2). If the pulse is not
generated at the middle of the period, the resulting frequency is incorrect for the required note.
3.3 V
0%
50%
100%
Figure 3-3. MC9RS08KA2 Piano and Dimming Light PWM
After the sound is generated, the application reads PTA2 and executes the function depending on the
switch position.
If the switch changes to position 2 (logical level 1), the application works on the dimmer light. For this part
of the firmware only one electrode is selected (signal A is active, signal C is set to GND). When the
electrode is pressed, the ACMP detects the voltage change. Then a value is read from the ADC. This
value is used to make a PWM and reveal the intensity light in a DC bulb. This application has only five
light intensities.
For more information about the firmware, refer to Figure 3-3.
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Firmware Description
Start
Configure MCU
Configure MTIM
Configure PTA5, PTA4, and PTA1 as Outputs
no
Is PTA2 pin set?
yes
Configure PTA4 as Output
Scan Electrodes
Configure MTIM
no
Is an electrode
Discharge Capacitor
pressed?
yes
Configure Analog Comparator
Which electrode was pressed (Musical note)?
Read Value from ADC
Increment Times Variable
Generate PWM
yes
Does times variable
= 255?
no
no
Is SensorReading
≤ 11?
Configure MTIM
yes
Generate PWM
Adjust sensor-reading variable for new PWM
Figure 3-4. MC9RS08KA2 PADL Flowchart Diagram
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Firmware Implementation
Appendix A. BOM and Schematics
Table A-1. MC9RS08KA2 PADL Reference Design Bill of Materials
Item
QTY
Reference
Description
Manufacturer
Part Number
1
3
C3,C5,C8
0.01μ
KEMET
399-1158-1-ND
2
3
C1,C4,C9
0.1 μ
KEMET
399-3676-1-ND
3
2
C2,C10
10 μ
KEMET
399-3687-1-ND
4
2
C6,C7
47 μ
KEMET
7343-31(D-EIA)
5
1
R5
120 Ω
Rohm
RHM120CC-ND
6
3
R4,R6,R7
1 kΩ
Panasonic
P1.0KACT-ND
7
2
R10,R11
2.2 kΩ
Yageo
311-2.2KARCT-ND
8
1
R8
39 kΩ
Yageo
311-39.0KCRCT-ND
9
2
R2,R9
47 kΩ
Yageo
311-47KARCT-ND
10
6
R1,R3,R12,R13,
R14,R15
10 kΩ
Yageo
311-10.0KCRCT-ND
11
2
NU
Pot 100 kΩ
Bourns
3266W-104-ND
12
1
NU
Lm358DR – Op
Amp
3-M
296-1014-1-ND
13
1
NU
EG4208 –
Switch
E-Switch
EG1914-ND
14
1
NU
MMBT6427 –
NPN Darlington
Fairchild
Semiconductor
MMBT6427-FSCT-ND
15
1
NU
Microcontroller
Freescale
Semiconductor
MC9RS08KA2
16
1
NU
Electrical Field
Freescale
Semiconductor
MC34940
17
1
NU
MMBT2222A –
BJT
Fairchild
MMBT2222A-FDICT-ND
18
1
NU
B0520WS-7-F –
Diode
Taiwan
Semiconductor
B0520WS-FDICT-ND
19
1
NU
Buzzer
Mallory
458-1064-ND
20
1
NU
7219 – Bulb
Chicago
Miniature
CM7219-ND
21
1
NU
22
1
NU
LM2937IMP-3.3
National
– 3.3V Regulator Semiconductor
PJ-002A – DC
Power Jack
CUI Inc
LM2937IMP-3.3CT-ND
CP-002A-ND
Piano and Dimming Light Using Ultra Low-End MCU and E-Field Sensor, Rev. 0
Freescale Semiconductor
25
Firmware Description
Figure A-1. PADL Block Diagram Schematic
Piano and Dimming Light Using Ultra Low-End MCU and E-Field Sensor, Rev. 0
26
Freescale Semiconductor
Subject to Change Without Notice
Firmware Implementation
Appendix B. Glossary
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
ACMP – Analog comparator module. It provides a circuit to compare two analog inputs’ voltage or
one analog input’s voltage to an internal reference.
ADC – Analog to digital converter.
Binary – Relating to the base 2 number system.
Bit – A binary digit that has a value of logic 0 or logic 1.
Byte – A set of 8 bits.
DC – Direct current.
EEPROM – Electrically erasable and programmable, read-only memory.
Firmware – Instructions and data that control the operation of a microcontroller.
MCU – Microcontroller unit, which is a complete computer system, including a CPU, memory, a
clock oscillator, and Input/Output (I/O) on a single integrated circuit.
PADL – Piano and dimming light.
Port – A set of wires for communicating with off-chip devices.
Prescaler – A circuit that generates an output signal related to the input signal by a fractional scale
such as 1/2, 1/8, 1/10, etc.
PWM – Pulse width modulation.
Toggle – To change the state of an output from logic 0 to logic 1 or from logic 1 to logic 0.
VBatt – Battery voltage.
Piano and Dimming Light Using Ultra Low-End MCU and E-Field Sensor, Rev. 0
Freescale Semiconductor
27
Firmware Description
Piano and Dimming Light Using Ultra Low-End MCU and E-Field Sensor, Rev. 0
28
Freescale Semiconductor
Subject to Change Without Notice
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DRM085
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10/2006